@article{f3065da2cf914bfab2ebf0953fecb069,
title = "Phase-partitioning and site-substitution patterns of molybdenum in a model Ni-Al-Mo superalloy: An atom-probe tomographic and first-principles study",
abstract = "Atom-probe tomography (APT) and first-principles calculations are employed to investigate the partitioning of Mo in the γ(f.c.c.)-and γ′(L1 2)-phases in a model Ni-6.5Al-9.9Mo at. superalloy. Mo is experimentally observed to partition preferentially to the γ(f.c.c.)-matrix, which is consistent with the smaller value of the γ(f.c.c.)-matrix substitutional formation-energy, with a driving force of 0.707 eV for partitioning as determined by first-principles calculations. APT measurements of the γ′(L1 2)-precipitate-phase composition and Al-, Mo-centered partial radial distribution functions indicate that Mo occupies the Al sublattice sites of the Ni 3Al(L1 2) phase. The preferential site-substitution of Mo at Al sublattice sites is confirmed by first-principles calculations.",
author = "Yiyou Tu and Zugang Mao and Seidman, {David N.}",
note = "Funding Information: This research was sponsored by the National Science Foundation under Grant DMR-080461, Dr. E. M. Taleff, grant monitor. The alloy was processed at the NASA Glenn Research Center by Dr. Ronald Noebe. APT measurements were performed at the Northwestern University Center for Atom Probe Tomography (NUCAPT). The LEAP tomograph was purchased with initial funding from the NSF-MRI (DMR 0420532, Dr. Charles Bouldin, grant officer) and ONR-DURIP (N00014-0400798, Dr. Julie Christodoulou, grant officer) programs. Additionally, the LEAP tomograph was enhanced with a picosecond ultraviolet laser with funding from the ONRDURIP (N00014-0610539, J. Christodoulou, grant officer).We gratefully acknowledge the Initiative for Sustainability and Energy at Northwestern (ISEN) for grants to upgrade the capabilities of NUCAPT. We wish to thank Research Professor Dieter Isheim for managing NUCAPT. We thank Ms. Elizaveta Plotnikov for discussions and some initial help with atom-probe tomography. An anonymous reviewer is thanked for detailed comments on our manuscript.",
year = "2012",
month = sep,
day = "17",
doi = "10.1063/1.4753929",
language = "English (US)",
volume = "101",
journal = "Applied Physics Letters",
issn = "0003-6951",
publisher = "American Institute of Physics Publising LLC",
number = "12",
}